My interpretation was he/she wanted their grandma to find it later, and possibly think it was hers that she lost and keep it. A lot of elderly people won't ask for help because they get embarrassed admitting they need hand outs, this is a win win for all! Well, theoretically it was...

My interpretation was he/she wanted their grandma to find it later, and possibly think it was hers that she lost and keep it. A lot of elderly people won't ask for help because they get embarrassed admitting they need hand outs, this is a win win for all! Well, theoretically it was...